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EMPLOYEE STOCK PLANS - Stock Option Information (Details) (USD $)
In Thousands, except Share data in Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable and in the Money, Number 0.7  
Weighted-average fair value of options granted (in usd per share) $ 0.77 $ 1.78
Intrinsic value of options exercised $ 3 $ 159
Cash received from options exercised $ 5 $ 127